In the fifth chapter, entitled Three Bullets, Jennifer Paige and her sister Lisa go into the police station and find the deputy there dead. They noticed the .45 revolver on the ground that belonged to the deputy, but then she finds three expended casings on the ground. A revolver doesn't expend empty shells, it holds them in the gun until someone swings out the cylinder of the gun and empties them by hand. A semi-automatic pistol expends shell casings, but the book describes it as a revolver, and Jenny even swings out the cylinder.

First of all, they find the pistol in the deputies hand, something I guess I should have mentioned before. Second of all, he is the only deputy in town and there are three casings on the ground and the revolver is missing three casings, not bullets, but the shells themselves. And finally, Dean Koontz himself admitted to this mistake, and said the reason why is that he was trying to make a creepy feeling of a deserted station and then the three fired shells lying on the ground and that he got so into that, he forgot that revolvers keep the shells in them after they've been fired. The only other guns in the station were locked away in the cabinet.